Drinking and Ambien are known to cause problems. I wonder if anyone has studied whether Toking while Ambien'd also causes problems? Maybe the makers of Ambien could fund one with the $800 million (pdf, p. 85) in sales generated in 2008 from the sleeping aid. Maybe it's the alcohol and not the Ambien that's the problem.

Craig Westberg, the DA for Archuleta, La Plata and San Juan counties, also must attend alcohol-education classes, perform 60 hours of public service and pay more than $3,000 in court costs and restitution for car damage.

....He was arrested in October 2007 after witnesses reported an erratic driver. Westberg has said he took an Ambien sleeping pill and left home to run an errand when his vision suddenly became blurred.